Apple LC 550 Specifications download pdf (Page 35)

Troubleshooting Symptom Charts/Miscellaneous

(Continued)

- 17

Miscellaneous

(Continued)

Screen shows “Sad

Macintosh” icon and

black vertical lines;

screeching sound

1 Replace RAM SIMMs on logic board.

2 Replace logic board. Retain customer’s SIMMs.

Headphone jack does

not operate correctly

1 Verify that headphone jack is seated properly.

2 Replace chassis harness assembly.

Speaker jacks do not

operate

1 Verify that speaker jacks are seated properly.

2 Replace logic board.

System automatically

restarts after

shutdown

Check whether test jumper is installed on analog board (location:

BD 11). If it is installed, remove it.

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Apple LC 550 Specifications Page 35